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Exams > 2020 Q85 — FRTS-1 Entry RCS Pressure Below 300

2020 Q85 — FRTS-1 Entry RCS Pressure Below 300

⚠️ DRAFT
Q85 — FRTS-1 Entry RCS Pressure Below 300 00WE08EA2.2 (4.1)
Given:

• Unit 2 is in MODE 3.
• RCS Temperature is 547°F
• RCS Pressure is 2235 psig.

Subsequently a LOCA occurs and the crew has transitioned from 2-EOP-TRIP-1, Reactor Trip or Safety Injection;

• RCS Pressure is 125 psig.
• RCS CETs read 380°F.
• RCS Cold Leg temperatures are 250°F.
• The RCS has cooled down > 100°F in the last 30 minutes.
• 22 RHR Pump failed to start.
• 21 RHR Pump is running providing 1150 gpm cold leg injection flow.
Based on the above conditions, complete the following statement;

Entry into 2-EOP-FRTS-1, RESPONSE TO IMMINENT PRESSURIZED THERMAL SHOCK CONDITIONS is …
A. made but NO actions are implemented before returning to procedure in effect.
B. NOT required since RCS pressure is below 350 psig.
C. made and a RCS temperature soak for a ONE hour period will be completed.
D. NOT required since S2.OP-AB.LOCA-0001, SHUTDOWN LOCA, will address any thermal shock concerns.
▶ Show Answer & Explanation
✓ A. Correct. 2-EOP-FRTS-1 is entered due to a PURPLE path on the CFSTs (RCS Cooldown > 100°F/hr, RCS T-colds > 230°F but < 280°F). The RCS Pressure Status step (1) then determines that RCS pressure is < 300 psig and that RHR flow is at least 300 gpm, directing a return to procedure in effect.
✗ B. Incorrect. Plausible because the candidate may believe that because RCS pressure is less than 350 psig a transition to 2-EOP-FRTS-1 is not required. Incorrect as although the first step in FRTS reviews RCS pressure < 300 psig and RHR flow ≥ 300 gpm, entry into the procedure is still required due to the PURPLE path on the CFSTs.
✗ C. Incorrect. Plausible because the candidate may remember 2-EOP-FRTS-1 requires a one-hour soak if the RCS cooldown has exceeded 100°F / hr. Incorrect as step 1 directs a return to the procedure in effect.
✗ D. Incorrect. Plausible because the candidate may believe that since the plant started in MODE 3 that AB.LOCA-0001 would be the appropriate mitigating procedure. Incorrect as AB.LOCA is used during MODE 4 or MODE 3 with the accumulators isolated and neither of those conditions existed in the stem. The EOP network is appropriately entered in MODE 3, at normal operating pressure.
Ref: 2-EOP-FRTS-1, Response to Imminent Pressurized Thermal Shock Conditions and Bases | LO: N/A | Source: Bank – Salem Vision Database | Cognitive: Comprehension

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